stm32中AD采样如何通过串口输入命令来修正温度值,用代码来表示
时间: 2024-10-13 22:14:33 浏览: 41
在STM32单片机中,如果想要通过串口接收命令并校正AD采样的温度值,你需要做以下几个步骤:
1. 首先,配置串口通信:设置STM32的串口模式(如USART1或USART2),包括波特率、数据位数、停止位以及校验方式等。
```c
void USART_Init(void) {
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
// 初始化GPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // 配置GPIOA时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; // RX/TX引脚
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 初始化USART
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART1, ENABLE); // 配置USART1时钟
USART_InitStructure.USART_BaudRate = 9600; // 设置波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
}
```
2. 当接收到串口数据时,解析命令来获取温度修正值。假设命令格式是"tempcorr=value",你可以创建一个函数来处理这个过程。
```c
uint16_t GetTemperatureCorrectionFromSerial(void)
{
uint16_t correction = 0;
char command[10];
if (USART_GetDataChar(USART1)) { // 等待接收到数据
fgets(command, sizeof(command), USART1); // 读取一行字符串
// 假设我们只关心数字部分,忽略其他字符
sscanf(command, "tempcorr=%hu", &correction);
}
return correction;
}
```
3. 对于AD采样的温度值,你有一个初始的计算方法,然后加上从串口获得的修正值。
```c
float GetCalibratedTemperature(float rawTemperature)
{
uint16_t correction = GetTemperatureCorrectionFromSerial();
return rawTemperature + ((float)correction / 100.0f); // 假设修正值是一个百分比
}
```
4. 最后,在需要的时候更新温度值,并可能更新显示或者其他系统状态。
```c
void UpdateDisplay(float calibratedTemperature)
{
// 根据calibratedTemperature更新UI或其他设备
}
```
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